Microbiology Lab Quiz

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Microbiology Lab Quiz - Quiz

Quiz for microbiology JCC campus


Questions and Answers
  • 1. 

    Turbidity is what?

    • A.

      Bacteria settle at the bottom

    • B.

      Bacteria move in a fast manor

    • C.

      Cloudiness

    • D.

      Bacteria grows up the side of glass

    Correct Answer
    C. Cloudiness
    Explanation
    Turbidity refers to the cloudiness of a liquid caused by the presence of suspended particles. In this context, it is used to describe the characteristic of cloudiness in a liquid. The answer "Cloudiness" accurately reflects the definition of turbidity.

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  • 2. 

    Sedimentation is what?

    • A.

      Turbidity

    • B.

      Bacteria settle on the bottom

    • C.

      Bacteria grow on surface

    • D.

      Bacteria suspended throughout entire broth

    Correct Answer
    B. Bacteria settle on the bottom
    Explanation
    Sedimentation refers to the process where particles or substances in a liquid settle down and accumulate at the bottom. In the context of the given options, sedimentation would mean that bacteria settle on the bottom of the liquid or broth. This indicates that the bacteria are not suspended throughout the entire broth but rather have settled down, possibly due to gravity or other factors.

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  • 3. 

    What is pellicle?

    • A.

      Scum layer where bacteria grows on surface

    • B.

      Bacteria growing up the side of the glass

    • C.

      Bacteria suspended throughout the entire broth

    • D.

      Cloudiness

    Correct Answer
    A. Scum layer where bacteria grows on surface
    Explanation
    Pellicle refers to a scum layer that forms on the surface of a liquid, typically a broth, where bacteria can grow. It is a visible film or membrane that develops due to the accumulation of bacterial cells and other substances. This layer is often observed in microbiology experiments and can indicate the presence of bacterial growth on the liquid's surface.

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  • 4. 

    What is a ring describing bacteria?

    • A.

      Coudiness

    • B.

      Bacteria suspended throughout the entire broth

    • C.

      Bacteria settles at the bottom

    • D.

      Bacteria grows up the side of the glass

    Correct Answer
    D. Bacteria grows up the side of the glass
    Explanation
    The correct answer is "Bacteria grows up the side of the glass." This describes a phenomenon called "ring formation" where bacteria form a visible ring or film on the sides of a glass container. This can occur when certain bacteria have the ability to adhere to surfaces and grow in a biofilm. The bacteria attach to the glass and multiply, forming a distinct ring-like pattern. This is often observed in laboratory settings when culturing bacteria in broth or liquid media.

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  • 5. 

    What does Ubiquitous mean?

    • A.

      Bacteria is no where

    • B.

      Bacteria is everywhere

    • C.

      Bacteria grows with food

    • D.

      Bacteria grows on certain time frames

    Correct Answer
    B. Bacteria is everywhere
    Explanation
    Ubiquitous means that something is present or found everywhere. Therefore, the correct answer is "Bacteria is everywhere." This implies that bacteria can be found in various environments and locations, indicating its widespread presence.

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  • 6. 

    Arrangements: strepto

    • A.

      Chaining

    • B.

      Clusters

    • C.

      Group of 4

    • D.

      Palisade

    Correct Answer
    A. Chaining
    Explanation
    The given word "strepto" can be rearranged to form the word "chaining". The other options "clusters", "group of 4", and "palisade" cannot be formed using the given letters. Hence, "chaining" is the correct answer.

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  • 7. 

    Arrangements: Staphylo

    • A.

      Chaining

    • B.

      Clusters

    • C.

      Group of 4

    • D.

      Next to each other

    Correct Answer
    B. Clusters
    Explanation
    The given arrangements involve the word "Staphylo" and the concept of chaining clusters. The word "clusters" refers to a group of four or more things that are next to each other. Therefore, the correct answer "Clusters" is the most suitable option that satisfies the given conditions of the question.

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  • 8. 

    Arrangements: Tetrad/Sarcinae

    • A.

      Singly

    • B.

      Chaining

    • C.

      Clusters

    • D.

      Group of 4

    Correct Answer
    D. Group of 4
    Explanation
    The given arrangements, Tetrad/Sarcinae, refers to a grouping or arrangement of four entities. This can be seen in the options provided, where "Group of 4" accurately describes the arrangement. The other options such as "singly," "chaining," and "clusters" do not accurately represent the idea of a group of four. Therefore, the correct answer is "Group of 4."

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  • 9. 

    Arrangements: Palisade

    • A.

      Chaining

    • B.

      Clusters

    • C.

      Next to each other

    • D.

      Group of 4

    Correct Answer
    C. Next to each other
    Explanation
    The term "Next to each other" suggests that the elements or objects mentioned in the arrangements are placed in close proximity to one another, without any gaps or spaces in between. This implies that they are arranged in a sequential or consecutive order, following one after the other. Therefore, the correct answer in this context would be "Next to each other".

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  • 10. 

    What color is Gram Negative stain?

    • A.

      Purple

    • B.

      Pink/red

    • C.

      Green

    • D.

      Blue

    Correct Answer
    B. Pink/red
    Explanation
    Gram Negative stain is a type of bacterial staining technique used in microbiology. It involves the use of crystal violet dye, iodine, alcohol, and a counterstain called safranin. The stain is used to differentiate between two major groups of bacteria: Gram-positive and Gram-negative. Gram-negative bacteria have a thinner peptidoglycan layer in their cell walls, which allows the crystal violet dye to be easily washed away during the decolorization step. As a result, Gram-negative bacteria appear pink or red after the application of the counterstain safranin. Therefore, the correct answer is pink/red.

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  • 11. 

    Effects of temperature: Psychrophile

    • A.

      Likes colder environments

    • B.

      Grows in heat

    • C.

      Likes our body temp

    • D.

      Likes Georgia

    Correct Answer
    A. Likes colder environments
    Explanation
    Psychrophiles are microorganisms that thrive in cold environments. They are adapted to survive and grow in temperatures below 20°C. This means that they are able to function optimally in colder conditions compared to other organisms. While they may still be able to grow in warmer temperatures, their preference and ability to thrive are highest in colder environments. Therefore, the statement "Likes colder environments" accurately describes the effects of temperature on psychrophiles.

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  • 12. 

    Effects of temperature: Mesophile

    • A.

      Likes the desert

    • B.

      Likes hot temperatures

    • C.

      Likes cold temperature

    • D.

      Likes our body temp

    Correct Answer
    D. Likes our body temp
    Explanation
    Mesophiles are organisms that thrive at moderate temperatures, typically around our body temperature. They are adapted to the conditions found in our bodies and can survive and reproduce within this temperature range. Unlike extremophiles, which prefer extreme temperatures, mesophiles are not suited for extremely hot or cold environments. Instead, they have evolved to function optimally at the temperature range commonly found in the human body. This adaptation allows them to efficiently carry out their biological processes and maintain their metabolic activities within our body.

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  • 13. 

    Effects of Temperature: Thermophile

    • A.

      Likes hotter Temperatures

    • B.

      Likes colder Temperatures

    • C.

      Likes our body temperatures

    • D.

      Likes the tv

    Correct Answer
    A. Likes hotter Temperatures
    Explanation
    The given answer "Likes hotter temperatures" is correct because thermophiles are organisms that thrive in high temperatures. They have adapted to survive and reproduce in extreme heat, such as hot springs or deep-sea hydrothermal vents. These organisms have specific enzymes and proteins that can withstand the high temperatures and perform their functions effectively. Therefore, thermophiles prefer and are well-suited to hotter temperatures.

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  • 14. 

    Pasturization

    • A.

      Kills all bacteria

    • B.

      Kills microbes

    • C.

      Only enough to kill the bad bugs

    • D.

      Kills everything and everyone

    Correct Answer
    C. Only enough to kill the bad bugs
    Explanation
    Pasteurization is a process that involves heating a food or beverage to a specific temperature for a certain period of time in order to kill harmful bacteria, viruses, and other pathogens. However, it does not kill all bacteria or microbes present. The purpose of pasteurization is to eliminate or reduce the number of harmful microorganisms to a safe level, ensuring that the product is safe for consumption. Therefore, the correct answer is "Only enough to kill the bad bugs."

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  • 15. 

    Sterilization

    • A.

      Kills all bacteria

    • B.

      Kills some bacteria

    • C.

      Kills you

    • D.

      Kills nothing

    Correct Answer
    A. Kills all bacteria
    Explanation
    Sterilization is a process that aims to eliminate all forms of microbial life, including bacteria. It involves using various methods such as heat, chemicals, or radiation to destroy or deactivate the microorganisms. Therefore, the correct answer is "Kills all bacteria."

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  • 16. 

    Why does different color dyes spread differently

    • A.

      Molecular weight and solubility

    • B.

      One color is stronger than the other

    • C.

      One color is brighter

    • D.

      They both spread the same

    Correct Answer
    A. Molecular weight and solubility
    Explanation
    Different color dyes spread differently due to their molecular weight and solubility. Molecular weight refers to the size of the dye molecules, with larger molecules spreading slower than smaller ones. Solubility, on the other hand, determines how easily the dye dissolves in a solvent or medium. Dyes with higher solubility will spread faster compared to those with lower solubility. Therefore, the differences in molecular weight and solubility between different color dyes result in variations in their spreading patterns.

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  • 17. 

    What is aero-tolerent

    • A.

      Bacteria that can grow with oxygen or without

    • B.

      Bacteria that grows with oxygen

    • C.

      Bacteria that grows without oxygen

    • D.

      Bacteria that eats constantly

    Correct Answer
    A. Bacteria that can grow with oxygen or without
    Explanation
    Aero-tolerant bacteria are able to grow in the presence or absence of oxygen. This means that they are not dependent on oxygen for their growth and can survive in both aerobic and anaerobic conditions. These bacteria have the ability to tolerate and adapt to different environmental conditions, allowing them to thrive in various habitats.

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  • 18. 

    What is Facultative Anaerobic bacteria?

    • A.

      Means bacteria prefers oxygen but "in a pinch" can grow without oxygen

    • B.

      Means bacteria can grow without oxygen

    • C.

      Means bacteria can grow with oxygen

    • D.

      Means bacteria doesn't like like anything

    Correct Answer
    A. Means bacteria prefers oxygen but "in a pinch" can grow without oxygen
    Explanation
    Facultative anaerobic bacteria are organisms that prefer to grow in the presence of oxygen, but they can also survive and grow in the absence of oxygen if necessary. This means that they have the ability to switch between aerobic respiration (using oxygen) and anaerobic respiration (using other electron acceptors) depending on the availability of oxygen. These bacteria are versatile and can adapt to different environments, making them capable of surviving in both oxygen-rich and oxygen-poor conditions.

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  • 19. 

    Low selective toxitity

    • A.

      Kills bacteria not good human cells

    • B.

      Kills all bacteria

    • C.

      Kills no bacteria

    • D.

      Kills all cells good and bad

    Correct Answer
    A. Kills bacteria not good human cells
    Explanation
    The correct answer suggests that the substance being referred to has low selective toxicity. This means that it is able to kill bacteria without harming good human cells. In other words, it specifically targets and eliminates bacteria while sparing the healthy human cells. This characteristic makes it an effective treatment option for bacterial infections, as it can effectively eliminate the harmful bacteria without causing harm to the patient's own cells.

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  • 20. 

    Denature Proteins

    • A.

      Starves bacteria

    • B.

      Disruption n possible destruction of both secondary and tertiary structures

    • C.

      Disrupting many things of bacteria including ribosomes

    • D.

      Disrupting many good and bad cells

    Correct Answer
    B. Disruption n possible destruction of both secondary and tertiary structures
    Explanation
    Denaturing proteins refers to the process of altering the structure of proteins, particularly the secondary and tertiary structures. This disruption can lead to the possible destruction of these structures, rendering the protein non-functional. In the context of bacteria, denatured proteins can interfere with essential cellular processes, such as the functioning of ribosomes. This disruption affects both good and bad cells, potentially leading to the starvation and destruction of bacteria.

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  • 21. 

    Oligodynamic

    • A.

      Chemical agent that stops bacteria from reproducing

    • B.

      Kills some bacteria and not others

    • C.

      Action to which a metal affects something

    • D.

      Kills all bacteria

    Correct Answer
    C. Action to which a metal affects something
    Explanation
    The term "oligodynamic" refers to the action in which a metal affects something. This can include the inhibition or prevention of bacterial growth and reproduction. The use of certain metals, such as silver or copper, has been found to have antimicrobial properties and can effectively kill or inhibit the growth of bacteria. Therefore, the correct answer in this case is "Action to which a metal affects something."

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  • 22. 

    Bacteriostatic

    • A.

      All bacteria has a low degree to which the substance can damage an organism

    • B.

      Place around the substance where there is no growth

    • C.

      Substance that kills bacteria but nothing else

    • D.

      Biological or chemical agent that stops bacteria from reproducing

    Correct Answer
    D. Biological or chemical agent that stops bacteria from reproducing
    Explanation
    The correct answer is "Biological or chemical agent that stops bacteria from reproducing." Bacteriostatic refers to an agent that inhibits the growth and reproduction of bacteria without necessarily killing them. It prevents the bacteria from multiplying and spreading, allowing the body's immune system to eventually eliminate them. This is different from a bactericidal agent, which kills bacteria outright.

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  • 23. 

    Brownian Motion, entire thing must be true

    • A.

      Particles in suspension due to H20

    • B.

      Particles suspended in H20 and are shaking due to water movement

    • C.

      Particles that move from one side of the slide to the other

    • D.

      Particles Moving in different directions

    Correct Answer
    B. Particles suspended in H20 and are shaking due to water movement
    Explanation
    The correct answer is "Particles suspended in H20 and are shaking due to water movement." This answer accurately describes the concept of Brownian motion, which is the random movement of particles suspended in a fluid due to the constant collisions with the fluid molecules. The shaking or movement of the particles is caused by the random motion of water molecules.

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